#浮点数计算
n1 = 2.1
n2 = 15.256
print(n1 + n2)

# 四舍五入round
n3 = round(n1 + n2,2)
print(n3)

import math
# 向上取整 ceil
n4 = math.ceil(n1 + n2)
print("向上取整的结果是",n4)
# 向下取整 floor
n5 = math.floor(n1 + n2)
print("向下取整的结果是",n5)
